What causes low frame rate in Unreal Play-In-Editor?

Play-In-Editor runs alongside the editor with unoptimized shaders, debug features, and the editor's own overhead, so frame rate is lower than a packaged development or shipping build.

How do I catch this when it only happens for some players?

Capture it automatically from the player's device with the full stack trace, the device and OS, the build, and a breadcrumb trail of what they did. That turns a vague complaint into a specific, reproducible issue you can fix without owning the hardware it happens on.

How to Fix Low Frame Rate in Unreal Play-In-Editor

Quick answer: Test a packaged development build for real performance, use standalone game mode, and account for editor overhead and unbuilt shaders when profiling in PIE.

Low frame rate in PIE is editor overhead. A packaged build shows real performance. Here is how.

How to fix it

1. Test a packaged build

Play-In-Editor shares resources with the editor and runs unoptimized. Package a development build to measure real performance, which is typically much better than PIE.

2. Use standalone game mode

Launch standalone game from the editor rather than PIE to reduce some editor overhead, giving a closer approximation of real performance than playing inside the editor viewport.

3. Account for unbuilt shaders and debug

PIE may compile shaders on the fly (causing hitches) and run debug features. Account for these when profiling so you do not mistake editor-only overhead for a real performance problem to optimize.

Catching the ones you can't reproduce

The hardest version of this to fix is the one you can't reproduce — it only happens on a player's hardware, OS, driver, or save state, under conditions that simply aren't present on your machine. A report that says “it crashed” or “it froze” gives you nothing to act on, so the bug survives release after release while quietly costing you players.

Automatic error capture closes that gap. Each failure arrives with its full stack trace, the device and OS, the build number, and a breadcrumb trail of what the player did right before it broke, so even a failure you have never seen becomes a specific, reproducible issue. Fold identical failures into one signature ranked by how many players each hits, and your worklist sorts itself worst-first instead of arriving as a stream of vague complaints.

This is where a tool like Bugnet earns its place. Its SDK captures every Unreal Engine error automatically with the full stack trace plus device, OS, memory, build, and game-state context, folds duplicates into one grouped issue with an occurrence count, and ties each to the build it first appeared on — so you fix the problem that hurts the most players first and confirm it is gone when its signature disappears from the next release.

Reproduce it once with full context and the fix writes itself. The hunt is the expensive part.